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Installing and gauging connecting rod bearings - AR03.10-P-6111-06AV

Modification notes

10.3.04 Figure revised from 0.026...0.054 mm to 0.022...0.067 mm Value modified in BE03.20-P-1002-04E on engine 112 except 112.951, 113.940/941/942/943/944/948/ 960/961/963/965/966/967/968/980/981 / 984/986 *BE03.20-P-1002-04E 
10.3.04 Value modified from 0.022...0.072 mm to 0.022...0.067 mm Value modified in BE03.20-P-1002-04E for engine 113.992 *BE03.20-P-1002-04E 
Check values of crankshaft bearing clearance

Number Designation Engine 112 except 112.951/976, Engines 113.940/941/ 942/943/944/ 948/960/961/ 963/964/965/ 966/967/968/ 971/980/981/ 984/986 Engine 113.987/988/989 /990/991/993 Engine 113.992/995
BE03.20-P-1002-04E Connecting rod radial when new bearing play mm 0.026 to 0.050 0.026 to 0.050 0.026 to 0.050
TORQUE SPECIFICATION Connecting rod

Number Designation Engine 112 except 112.951/976, Engines 113.940/941/942/ 943/944/945/946/ 948/960/961/962/ 963/964/965/966/ 967/968/971/980/ 981/982/984/986/ 987/988/990/991/ 992/993
BA03.10-P-1001-01E Connecting rod bolt Stage 1 Nm 5
Stage 2 Nm 25
Stage 3 ∠° 90
Fig 1: Identifying External Torx Set (001 589 76 09 00)
G04605647Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  1. Clean the bearing points of connecting rod, connecting rod bearing caps and connecting rod bearing journals with a chamois leather.

    IMPORTANT Blow through oil ducts in direction of flow oil with compressed air. Do not use any hard objects for cleaning.

  2. The assignment of connecting rods to the connecting rod bearing journals is indicated on the back of the connecting rod bearing shells by a colored dot.

    IMPORTANT Only assigned color combinations of the connecting rod bearing shells may be combined, yellow with yellow and red with blue.

    The sequence of the individual color combinations on the connecting rod bearing journals can be selected at random.

  3. Insert connecting rod bearing shells (7) into the connecting rod (4) and connecting rod bearing cap

    NOTES The connecting rod bearing shell (7) with the oil drilling (arrow) must be installed in the connecting rod (4) otherwise the connecting rod bearings will not be lubricated.

    IMPORTANT The anti-twist locks (8) of the connecting rod bearing shells (7) must be located in the slots (9) of the connecting rods (4) and the connecting rod bearing caps.

    Fig 2: Locating Bearing Points Of Connecting Rod
    G04605648Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  4. Install connecting rod bearing cap with connecting rod bearing shells (7).
  5. Lubricate thread and bolt head contact surface of connecting rod bolts with engine oil.
  6. Screw in connecting rod bolts and tighten to step 1 TORQUE SPECIFICATION .

    Shown on engine 112 

    Fig 3: Locating Connecting Rod Bearing Cap With Connecting Rod Bearing Shells
    G04605649Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  7. Tighten connecting rod bolts to step 2 TORQUE SPECIFICATION .
  8. Tighten connecting rod bolts using an angle wrench to step 3 TORQUE SPECIFICATION .

    IMPORTANT If no torquing angle wrench is available, the connecting rod screws can be torqued further by the specified angle in a single operation using a wrench and tommy bar.

    Do not use a flexi-rod torque wrench for tightening in order to avoid any angle errors.

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